Impact damage analysis and minimum penetration energy prediction of CFRP laminated cylindrical shell for automotive applications
The damage and energy absorption characteristics of carbon fiber reinforced polymer(CFRP)laminated cylindrical shells under the condition of drop hammer impact were studied to explore the application prospect of CFRP in automotive curved parts.Based on the homogenization method of composite materials,a multi-scale model of CFRP laminated cylindrical shells was established to investigate the effect of radius of curvature on the impact damage and energy absorption of CFRP laminated cylindrical shells under the penetration condition.The functional relationship between the minimum penetration energy and the material parameters of the laminated cylindrical shell,structural parameters and drop hammer parameters was established with the nonlinear fitting method,so as to realize the rapid prediction of the minimum penetration energy at the conceptual design stage.Compared with the simulation results,the error of the fitting formula is less than 20%.The results show that the peak load width of laminated cylindrical shell is larger and more stable than that of flat plate.Under the impact of 60 J,the damage area of each layer of the laminated cylindrical shell is relatively uniform,and the damage area of the fiber is independent of the curvature radius,and the damage area of the matrix increases with the curvature radius.When the radius of curvature is 100 mm,the laminated shell has good bearing capacity and deformation resistance,and has good impact resistance.When the curvature radius is 200 mm,the laminated shell dissipates the most energy,and the energy absorption effect is better.
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